# Fast DDC The RP2040 has the handy ability to boot as a USB storage device. You can then simply drag-drop a firmware file into the drive, and it will automatically restart with the new firmware running. There are a few ways to boot as storage device: * As long as it has no program running it will default to booting as storage device. For instance when coming straight from factory. * Holding the BOOTSEL button when powering up. * Using [firmwareUploadMode()](/ddc/switch-library/utility.md#firmwareuploadmode) function, though this requires you to upload a firmware with this function first. Community legend ZebbeBa has made several ready-to-use firmware files to drop onto your RP2040 boards. No coding required. Just chose the firmware that suits your needs and follow the wiring diagrams. Naturally, these ready-to-use setups are generalized and aren't feature-packed. But they will do for most projects, and can help you get familiar with using DDC. For firmwares using encoders there are different options for different types of encoders. You could try them all and see which one works the best. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://dahl-design.gitbook.io/ddc/fast-ddc.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.